Which of these statements of comparison regarding DNA and RNA holds true ?

Options

A. DNA chemically is less reactive and structurally less stable when compared to RNA.
B. DNA chemically is more reactive and structurally less stable when compared to RNA.
C. DNA chemically is less reactive and structurally more stable when compared to RNA.
D. DNA chemically is more reactive and structurally more stable when compared to RNA.

Answer

To determine which statement regarding DNA and RNA holds true, we can analyze the properties of both molecules step by step.

### Step-by-Step Solution:

1. **Structure of DNA and RNA**:
- DNA (Deoxyribonucleic Acid) is typically double-stranded, forming a double helix structure.
- RNA (Ribonucleic Acid) is usually single-stranded.

2. **Stability**:
- The double-stranded structure of DNA provides greater stability due to the hydrogen bonds between the complementary bases.
- RNA, being single-stranded, is less stable than DNA.

3. **Chemical Reactivity**:
- DNA is chemically less reactive compared to RNA. This is because its stable double-stranded structure makes it less prone to chemical reactions.
- RNA, on the other hand, is more reactive due to its single-stranded nature and the presence of the hydroxyl group (-OH) on the ribose sugar, which makes it more susceptible to hydrolysis.

4. **Comparison of Statements**:
- The statement "DNA chemically is less reactive and structurally more stable compared to RNA" is true.
- Other statements that suggest DNA is less stable or more reactive than RNA are incorrect.

### Conclusion:
The correct statement is that DNA is chemically less reactive and structurally more stable compared to RNA.